齿轮疲劳强度与裂纹萌生区域的预测研究  

Prediction of fatigue strength and region of crack initiation of transmission gear

作　　者：卢曦[1] 郑松林[1] 冯金芝[1] 

机构地区：[1]上海理工大学机械工程学院汽车研究所,上海200093

出　　处：《材料热处理学报》2008年第1期80-84,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(50375101);上海市自然科学基金(07ZR14081);上海市教育委员会科研项目(07ZZ86)

摘　　要：以经过表面强化后的国产某轿车变速箱齿轮为例，根据齿根附近沿深度的残余应力和硬度的分布对单齿弯曲疲劳强度和疲劳裂纹萌生区域的预测进行了分析和试验验证。通过强度和硬度之间的转换关系以及疲劳强度与残余应力的作用关系，得到了齿根附近沿深度的弯曲疲劳极限分布，齿根次表面下0．25～0．45mm之间的区域是疲劳危险区。齿轮表面强化的结果使得齿轮弯曲疲劳裂纹源从表面转入到次表面，并初步得到了微观验证。研究结果说明了基于残余应力和硬度可以进行疲劳强度和疲劳裂纹萌生区域的预测。Fatigue strength and the area of crack initiation were investigated based on the distribution of residual stress and hardness along the depths at root of automobile transmission gear. The distribution of bending fatigue limits in different depths at root was obtained by means of the distribution of residual stress and hardness as well as the relationship between strength and hardness. The dangerous area of fatigue and crack initiation that proved by microcosmic tests are beneath the surface with 0.25 -0.45mm. The investigated results show that the fatigue strength and crack initiation could be predicted by residual stress and hardness.

关 键 词：残余应力 硬度 疲劳强度 裂纹萌生 变速箱齿轮 

分 类 号：TG113.25[金属学及工艺—物理冶金] U463.3[金属学及工艺—金属学]